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SUBMIT A PRSUBMIT AN ISSUElast edit: Sep 10, 2025

Announcements and Developments

This page tracks recent and upcoming changes to the Bittensor protocol and other major events in the Bittensor ecosystem.

Sub-Subnets (Major Feature Launch)​

Status: Ready for deployment on September 12, 2025

  • What: Sub-subnets allow subnet owners to apportion emissions across multiple sub-subnets, each running Yuma Consensus independently
  • Key Features:
    • Enables up to 8 sub-subnets (IDs 0-7) within each main subnet for multi-task validation
    • Fully backward-compatible with existing miners and validators via sub-subnet ID 0
    • Each sub-subnet has its own weight matrix and independent emissions
    • All validators participate in all sub-subnets with identical stake weights
    • Miners automatically participate in ALL sub-subnets when registering for a subnet
    • Emissions are divided evenly, but subnet owners can configure proportions.
    • First version focuses on core functionality with additional features planned based on community feedback

Hyperparameter Rate Limiting​

Status: WIP

  • What: Prevents subnet owners from changing hyperparameters too frequently
  • Rules: Cannot change hyperparameters in last 10 blocks of a tempo
  • Purpose: Prevent exploitation where subnet owners kick off root validators to take full incentives
  • Implementation: Applies 7,200-block rate limit to prevent subnet owner exploitation

Child Key Fee​

A percentage fee will be deducted from emissions bound to validator hotkeys through a child hotkey relationship. This is designed to more highly incentivize validators who perform validation work, over child-key-only validators. It is being gradually rolled out to reduce surprise for the community and allow validators to adjust.

Status: Implemented (Merged)

  • Plan:
    • Start at 1% (September 10)
    • 30-day delay
    • Increase by 1% per day for 17 days
    • Final rate: 18%

Changes to the Subnet Registration/Deregistration Process​

Status: Ready for deployment on September 16, 2025

  • Key Changes:
    • Subnet limit remains at 128 initially with no new registrations available immediately
    • Immunity period reduced from 6 months to 4 months from registration block
    • Network rate limit increased to 3 days (from 2 days) between registrations
    • Initial lock cost set at 1,000 TAO with standard linear decay mechanism
    • First deregistrations available approximately September 23 (one week after deployment)

Auto-Staking for Miners​

Status: Implemented (Merged)

  • What: Miners can automatically stake their mining income to a validator of their choice
  • Implementation:
    • New extrinsics set_coldkey_auto_stake_hotkey and get_coldkey_auto_stake_hotkey
    • Set per coldkey, affects all miner hotkeys
    • No transaction fees required
    • Reduces sell pressure by allowing automatic delegation of mining rewards
    • Event emission system being added to distinguish mining vs staking rewards for proper accounting
    • Requires CLI support for configuration and management

Registration Fee Controls​

Status: Deployed

  • What: Subnet owners can configure neuron registration fees
  • Implementation:
    • Subnet owners can configure neuron registration fees between 0.1 and 1 TAO